Air purifier



FIG. 1 is a front view of an air purifier showing our new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a perspective view of the front side thereof;

FIG. 8 is a perspective view of the rear side thereof;

FIG. 9 is a perspective view of the top-front side thereof; and,

FIG. 10 is a perspective view of the bottom-rear side thereof.

The broken lines depict portions of an air purifier in which the design is embodied that form no part of the claimed design. 

CLAIM The ornamental design for an air purifier, as shown and described. 